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 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
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 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
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package org.glassfish.jersey.inject.hk2;

import java.lang.annotation.Annotation;

import javax.inject.Singleton;

import org.glassfish.hk2.api.ActiveDescriptor;
import org.glassfish.hk2.api.Context;
import org.glassfish.hk2.api.ServiceHandle;

/**
 * The context keeping the objects created in {@link ProxiableSingleton} scope.
 */
@Singleton
public class ProxiableSingletonContext implements Context<ProxiableSingleton> {

    @Override
    public Class<? extends Annotation> getScope() {
        return ProxiableSingleton.class;
    }

    @Override
    public <U> U findOrCreate(ActiveDescriptor<U> activeDescriptor, ServiceHandle<?> root) {
        U cached = activeDescriptor.getCache();
        if (cached != null) {
            return cached;
        }

        cached = activeDescriptor.create(root);
        activeDescriptor.setCache(cached);
        return cached;
    }

    @Override
    public boolean containsKey(ActiveDescriptor<?> descriptor) {
        return descriptor.isCacheSet();
    }

    @SuppressWarnings("unchecked")
    @Override
    public void destroyOne(ActiveDescriptor<?> descriptor) {
        if (!descriptor.isCacheSet()) {
            return;
        }

        Object value = descriptor.getCache();
        descriptor.releaseCache();

        ((ActiveDescriptor<Object>) descriptor).dispose(value);

    }

    @Override
    public boolean supportsNullCreation() {
        return false;
    }

    @Override
    public boolean isActive() {
        return true;
    }

    @Override
    public void shutdown() {
    }
}
